Injectable Peptides for Anti Aging? A Dermatologist Explains GHK Cu Absence of evidence isnt evidence of absence its a popular argument, but its not how we should be guiding treatment decisions. In this short, I respond to a comment about GHK Cu injections for If your GHK injection site gets irritated try this , 1. Dilute it by adding more water to the syringe , 2. Let it sit until it reaches room temperature , Also, make sure youre rotating injection GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B